Zix (ZIXI) 10-K 11 Mar 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Mar. 09, 2015	Jun. 30, 2014
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	FALSE
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Trading Symbol	ZIXI
Entity Registrant Name	ZIX CORP
Entity Central Index Key	855612
Current Fiscal Year End Date	-19
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		56,984,827
Entity Public Float			$199,220,616

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets:
Cash and cash equivalents	$21,685	$27,518
Receivables, net	1,452	2,324
Prepaid and other current assets	2,372	2,038
Deferred tax assets	1,763	1,814
Total current assets	27,272	33,694
Property and equipment, net	4,399	2,608
Goodwill	2,161	2,161
Deferred tax assets	49,892	52,239
Total assets	83,724	90,702
Current liabilities:
Accounts payable	506	495
Accrued expenses	2,930	1,992
Deferred revenue	21,587	19,080
Total current liabilities	25,023	21,567
Long-term liabilities:
Deferred revenue	898	1,278
Deferred rent	1,533	1,623
Total long-term liabilities	2,431	2,901
Total liabilities	27,454	24,468
Commitments and contingencies (Note 13)
Stockholders' equity:
Preferred stock, $1 par value, 10,000,000 shares authorized; none issued and outstanding
Common stock, $0.01 par value, 175,000,000 shares authorized; 75,017,775 issued and 56,980,789 outstanding in 2014 and 74,417,946 issued and 60,513,287 outstanding in 2013	741	737
Additional paid-in capital	361,579	359,154
Treasury stock, at cost; 18,036,986 common shares in 2014 and 13,904,659 common shares in 2013	-66,882	-50,386
Accumulated deficit	-239,168	-243,271
Total stockholders' equity	56,270	66,234
Total liabilities and stockholders' equity	$83,724	$90,702

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Preferred stock, par value	$1	$1
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	175,000,000	175,000,000
Common stock, shares issued	75,017,775	74,417,946
Common stock, shares outstanding	56,980,789	60,513,287
Treasury stock, shares	18,036,986	13,904,659

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Revenues	$50,347	$48,138	$43,356
Cost of revenue	8,324	7,614	7,609
Gross margin	42,023	40,524	35,747
Research and development expenses	9,051	9,563	7,419
Selling, general and administrative expenses	26,222	21,646	19,385
Operating income	6,750	9,315	8,943
Other income (expense):
Investment and other income	183	132	112
Interest expense			-1
Total other income	183	132	111
Income before income taxes	6,933	9,447	9,054
Income tax (expense) benefit	-2,830	1,006	1,949
Net income	$4,103	$10,453	$11,003
Basic income per common share	$0.07	$0.17	$0.18
Diluted income per common share	$0.07	$0.17	$0.17
Weighted average shares outstanding
Basic common shares outstanding	57,948,864	61,139,035	62,211,228
Diluted common shares outstanding	58,966,625	62,526,507	62,875,347

Consolidated_Statements_of_Sto

Consolidated Statements of Stockholders' Equity (USD $)	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Accumulated Deficit [Member]
In Thousands, except Share data
Beginning balance at Dec. 31, 2011	$57,757	$726	$354,265	($32,506)	($264,728)
Beginning balance, shares at Dec. 31, 2011		72,639,465
Issuance of common stock upon exercise of stock options	308	2	306
Issuance of common stock upon exercise of stock options, shares	174,968	174,968
Issuance of restricted common stock, shares		351,000
Employee stock-based compensation costs	1,166		1,166
Non-employee stock-based compensation	10		10
Treasury repurchase program	-9,000			-9,000
Net income	11,003				11,003
Ending balance at Dec. 31, 2012	61,245	728	355,747	-41,506	-253,724
Ending balance, shares at Dec. 31, 2012		73,165,433
Issuance of common stock upon exercise of stock options	1,705	9	1,696
Issuance of common stock upon exercise of stock options, shares	839,263	839,263
Issuance of common stock upon vesting of restricted stock units, shares		28,250
Issuance of restricted common stock, shares		385,000
Employee stock-based compensation costs	1,591		1,711	-120
Treasury repurchase program	-8,760			-8,760
Net income	10,453				10,453
Ending balance at Dec. 31, 2013	66,234	737	359,154	-50,386	-243,271
Ending balance, shares at Dec. 31, 2013		74,417,946
Issuance of common stock upon exercise of stock options	748	4	744
Issuance of common stock upon exercise of stock options, shares	407,829	407,829
Issuance of common stock upon vesting of restricted stock units, shares		52,000
Issuance of restricted common stock, shares		140,000
Employee stock-based compensation costs	1,424		1,681	-257
Treasury repurchase program	-16,239			-16,239
Net income	4,103				4,103
Ending balance at Dec. 31, 2014	$56,270	$741	$361,579	($66,882)	($239,168)
Ending balance, shares at Dec. 31, 2014		75,017,775

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities:
Net income	$4,103	$10,453	$11,003
Non-cash items in net income:
Depreciation and amortization	1,623	1,466	1,343
Employee stock-based compensation expense	1,681	1,711	1,166
Non-employee stock-based compensation			10
Changes in deferred taxes	2,398	-1,401	-2,295
Changes in operating assets and liabilities:
Receivables	872	-1,357	-263
Prepaid and other assets	-334	-341	-275
Accounts payable	-1	-103	140
Deferred revenue	2,127	1,986	1,009
Accrued and other liabilities	848	884	695
Net cash provided by operating activities	13,317	13,298	12,533
Investing activities:
Purchases of property and equipment	-3,402	-1,593	-1,533
Net cash used in investing activities	-3,402	-1,593	-1,533
Financing activities:
Proceeds from exercise of stock options	748	1,705	308
Treasury stock	-16,496	-8,880	-9,000
Net cash used in financing activities	-15,748	-7,175	-8,692
Increase (decrease) in cash and cash equivalents	-5,833	4,530	2,308
Cash and cash equivalents, beginning of year	27,518	22,988	20,680
Cash and cash equivalents, end of year	$21,685	$27,518	$22,988

Company_Overview

Company Overview	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Company Overview	1. Company Overview
	Zix Corporation (“ZixCorp,” the “Company,” “we,” “our,” “us”) provides email encryption, data loss prevention (“DLP”) and Bring-Your-Own-Device (“BYOD”) solutions to meet the data protection and compliance needs of organizations primarily in the healthcare, financial services, and government sectors.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies
	Basis of Presentation — The accompanying consolidated financial statements include the accounts of all our wholly-owned subsidiaries and are prepared in accordance with accounting principles generally accepted in the United States of America. All inter-company accounts and transactions have been eliminated in consolidation.
	Use of Estimates — The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenue and expenses during the reported period. Our significant estimates include primarily those required in the valuation or impairment analysis of goodwill, property and equipment, revenue recognition, allowances for doubtful accounts, stock-based compensation, litigation accruals, valuation allowances for deferred tax assets and tax accruals. Although we believe that adequate accruals have been made for unsettled issues, additional gains or losses could occur in future years from resolutions of outstanding matters. Actual results could differ materially from original estimates.
	Cash Equivalents — Cash investments with maturities of three months or less when purchased are considered cash equivalents.
	Fair Value of Financial Instruments —The Company does not measure the fair value of any financial instrument other than cash equivalents, options, and other equity awards. The carrying values of other financial instruments (receivables and accounts payable) are not recorded at fair value but approximate fair values primarily due to their short-term nature. The carrying values of other current assets and accrued expenses are also not recorded at fair value, but approximate fair values primarily due to their short-term nature.
	Valuation of Property and Equipment — The accounting policies and estimates relating to property and equipment are considered significant because of the potential impact that impairment, obsolescence, or change in an asset’s useful life could have on the Company’s operating results.
	We record an impairment charge on the assets to be held and used when we determine based upon certain triggering events that the carrying value of property and equipment may not be recoverable based on expected undiscounted cash flows attributable to such assets. The amount of a potential impairment is determined by comparing the carrying amount of the asset to either the value determined from a projected discounted cash flow method, using a discount rate that is considered to be commensurate with the risk inherent in the Company’s current business model or the estimated fair market value. Assumptions are made with respect to future net cash flows expected to be generated by the related asset. An impairment charge would be recorded for an amount by which the carrying value of the asset exceeded the discounted projected net cash flows or estimated fair market value. Also, even where a current impairment charge is not necessary, the remaining useful lives are evaluated. No impairment was recorded for any of the periods presented.
	Property and equipment are recorded at cost and depreciated or amortized using the straight-line method over their estimated useful lives as follows: computer and office equipment and software — three years; leasehold improvements — the shorter of five years or the lease term; and furniture and fixtures — five years.
	Goodwill — We account for the valuation of goodwill and other intangible assets after classifying intangible assets into three categories: (1) intangible assets with finite lives subject to amortization; (2) intangible assets with indefinite lives not subject to amortization; and (3) goodwill. For intangible assets with finite lives, tests for impairment must be performed if conditions exist that indicate the carrying value may not be recoverable. For intangible assets with indefinite lives and goodwill, tests for impairment must be performed at least annually or more frequently if events or circumstances indicate that assets might be impaired.
	Goodwill was $2.2 million, or 3% and 2% of total assets for the years ended December 31, 2014 and 2013, respectively.
	Our goodwill is not being amortized, but we do evaluate the goodwill for impairment annually in the fourth quarter, or when there is reason to believe that the value has been diminished or impaired. Evaluations for possible impairment are based upon a comparison of the estimated fair value of the reporting unit to which the goodwill has been assigned, versus the sum of the carrying value of the assets and liabilities of that unit including the assigned goodwill value. The fair values used in this evaluation are estimated based on the Company’s market capitalization, which is based on the outstanding stock and market price of the stock. Impairment is deemed to exist if the net book value of the unit exceeds its estimated fair value. No impairment was recorded for any of the periods presented.
	Deferred Tax Assets — Deferred tax assets are recognized if it is “more likely than not” that the benefit of the deferred tax asset will be realized on future federal or state income tax returns. At December 31, 2014, we provided a valuation allowance against a significant portion, $46.0 million, of our accumulated U.S. deferred tax assets, reflecting our historical losses and the uncertainty of future taxable income sufficient to utilize net operating loss carryforwards prior to their expiration. Our total deferred tax asset not subject to a valuation allowance is valued at $51.7 million, and consists of $43.5 million for federal net operating loss carryforwards, $5.2 million relating to temporary timing differences between GAAP and tax-related expense, $1.9 million relating to U.S. state income tax credits and $1.1 million related to Alternative Minimum Tax credits. If U.S. taxable income increases from its current level in a future period or if the facts and circumstances on which our estimates and assumptions are based were to change, thereby impacting the likelihood of realizing the deferred tax assets, judgment would have to be applied in determining the amount of valuation allowance no longer required. Reversal of all or a part of this valuation allowance could have a significant positive impact on operating results in the period that it becomes more likely than not that certain of the Company’s deferred tax assets will be realized. Alternatively, should our future income decrease from current levels, a resulting increase to all or a part of this valuation allowance could also have a significant negative impact on our operating results.
	Leases — A leased asset whose lease terms meet the criteria for capitalization is recorded as an asset and depreciated. If a lease does not meet the criteria for capitalization, it is classified as an operating lease and payments are recorded as rent expense. For 2014 and 2013 we had no leases that qualified as capital leases. Lease renewal options which we are “reasonably assured” of using and the related payments are taken into account when initially classifying and recording the lease as a capital lease obligation or as straight-line rent if an operating lease. Funds provided by the lessor for leasehold improvements are recorded as a deferred lease incentive and amortized as a reduction of rent expense over the lease term.
	Revenue Recognition — We develop, market, and support applications that connect, protect and deliver information in a secure manner. Our services can be placed into several key revenue categories where each category has similar revenue recognition traits: Email Encryption, DLP, and BYOD email subscription-based services, various transaction fees and related professional services. The majority of the revenues generated are through a combination of direct sales and a network of resellers and other distribution partners.
	Under all product categories and distribution models, we recognize revenue after all of the following occur:
		•	persuasive evidence of an arrangement exists,
		•	delivery has occurred or services have been rendered,
		•	the price is fixed and determinable, and
		•	collectability is reasonably assured.
	Discounts provided to customers are recorded as reductions in revenue.
	Our Email Encryption, DLP and BYOD services are subscription services. Providing these services includes delivering subscribed-for software and providing secure electronic communications and customer support throughout the subscription period. Our subscribers generally execute multiple-year contracts that are irrevocable and non-refundable in nature and require annual, up-front payments. Subscription fees received from customers are initially recorded as deferred revenue and then recognized as revenue ratably over the subscription period. We do not offer stand alone services. Further, our services primarily include manufacturer provided warranty provisions. We recorded no warranty expense in any of the presented periods.
	Software Development Costs — Costs incurred in the development and testing of software used in the Company’s Email Encryption, DLP, and BYOD email services related to research, project planning, training, maintenance and general and administrative activities, and overhead costs are expensed as incurred. The costs of relatively minor upgrades and enhancements to the software are also expensed as incurred.
	Costs for the development of new software solutions and substantial enhancements to existing software solutions are expensed as incurred until technological feasibility has been established, at which time any additional costs would be capitalized. No research and development costs have been capitalized because we believe that technological feasibility is established concurrent with general release to customers.
	Advertising Expense — Advertising costs are expensed as incurred. Our operations include advertising expense of $2.9 million, $959 thousand, and $538 thousand in 2014, 2013, and 2012, respectively.
	Stock-Based Compensation — We currently use the straight-line amortization method for recognizing stock option and restricted stock compensation costs. The measurement and recognition of compensation expense for all share-based payment awards made to our employees, directors or outside service providers are based on the estimated fair value of the awards on the grant dates. The grant date fair value is estimated using either an option-pricing model which is consistent with the terms of the award or a market observed price, if such a price exists. Such cost is recognized over the period during which an employee, director or outside service provider is required to provide service in exchange for the award, i.e., “the requisite service period” (which is usually the vesting period). We also estimate the number of instruments that will ultimately be earned, rather than accounting for forfeitures as they occur.
	Earnings Per Share (“EPS”) — Basic EPS is based on the weighted average number of common shares outstanding during each period. Diluted EPS adjusts Basic EPS for the effects of dilutive common stock equivalents outstanding during each period using the treasury stock method.
	New Accounting Standards
	Revenue Recognition
	In May 2014, the FASB issued Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (ASU 2014-09), which supersedes most current revenue recognition guidance under U.S. GAAP. The core principle of ASU 2014-09 is to recognize revenues when promised goods or services are transferred to customers in an amount that reflects the consideration to which an entity expects to be entitled for those goods or services. ASU 2014-09 defines a five step process to achieve this core principle and, in doing so, more judgment and estimates may be required within the revenue recognition process than are required under existing U.S. GAAP.
	The standard is effective for us beginning 2017, and requires using either of the following transition methods: (i) a full retrospective approach reflecting the application of the standard in each prior reporting period with the option to elect certain practical expedients, or (ii) a retrospective approach with the cumulative effect of initially adopting ASU 2014-09 recognized at the date of adoption (which includes additional footnote disclosures). We are currently evaluating the impact of our pending adoption of ASU 2014-09 on our consolidated financial statements and have not yet determined the method by which we will adopt the standard in 2017.
	Unrecognized Tax Benefit
	In July 2013, the FASB issued guidance that requires entities to present unrecognized tax benefits (UTB) in the financial statements as a reduction to a deferred tax asset (DTA) for a net operating loss (NOL) carryforward when NOL’s exist. Entities whose NOL carryforwards are not available to settle taxes that would result from the disallowance of the tax position, or who do not intend to use their DTA for that purpose, should present their UTB as a liability and should not net the UTB with the DTA. The guidance became effective for us at the beginning of 2014. This new guidance did not have a material impact on our consolidated financial statements.

Stock_Options_and_Stockbased_E

Stock Options and Stock-based Employee Compensation	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Options and Stock-based Employee Compensation	3. Stock Options and Stock-based Employee Compensation
	Below is a summary of common stock options outstanding at December 31, 2014:
		Authorized			Options			Options			Available
		Shares			Outstanding			Vested			for Grant
	Employee and Director Stock Option Plans:
	1995 Long-term Incentive Plan		1,825,000			350,000			350,000			—
	2001 Stock Option Plan		2,525,000			428,296			428,296			—
	2001 Employee Stock Option Plan		300,000			12,860			12,860			—
	2003 New Employee Stock Option Plan		500,000			12,000			12,000			—
	2004 Stock Option Plan		5,000,000			2,706,353			2,665,514			—
	2004 Director’s Stock Option Plan		300,000			65,000			65,000			—
	2006 Director’s Stock Option Plan		1,100,000			255,500			255,500			—
	2012 Incentive Plan		2,700,000			660,500			346,561			839,404
	Total		14,250,000			4,490,509			4,135,731			839,404
	Under all of our stock option plans, new shares are issued when options are exercised.
	Employee and Director Stock Option Plans
	We have non-qualified stock options outstanding to employees and directors under various stock option plans. The plans require the exercise price of options granted under these plans to equal or exceed the fair market value of the Company’s common stock on the date of grant. The options, subject to termination of employment, generally expire ten years from the date of grant. Historically, our employee options typically vested pro-rata and quarterly over three years. Option grants to employees, officers and directors frequently contain accelerated vesting provisions upon the occurrence of a change of control, as defined in the applicable option agreements.
	Under the terms of the 2012 Incentive Plan adopted by the Company’s Board of Directors on April 13, 2012 (the “2012 Plan”), 2,700,000 shares are available for issuance, plus a number of additional shares (not to exceed 1,327,000) underlying options outstanding under certain of the Company’s prior equity plans that thereafter terminate or expire unexercised, or are cancelled, forfeited, or lapse for any reason. Awards issued under the 2012 Plan typically vest pro-rata and quarterly over four years.
	Other Stock Option Agreements:
	From time to time we may grant stock options to consultants, contractors and other third parties for services provided to the Company. These options are expensed based on their fair values as calculated by using the Black-Scholes Option Pricing Model (“BSOPM”). At December 31, 2014, options outstanding to non-employees were 25,000, which were granted from our stock option plans.
	Accounting Treatment
	We use the straight-line amortization method for recognizing stock option compensation costs. Our share-based awards include stock options, restricted stock awards (“RSAs”), restricted stock units (“RSUs”), and performance units (“PUs”).
	For the twelve months ended December 31, 2014, 2013, and 2012, respectively, the total stock-based compensation expense resulting from stock options, RSAs, RSUs, and PUs was recorded to the following line items of our consolidated statement of income:
		Year Ended December 31,
	(In thousands)	2014			2013			2012
	Cost of revenue	$	180		$	172		$	136
	Research and development expenses		237			212			142
	Selling, general and administrative expenses		1,264			1,327			888
	Stock-based compensation expense	$	1,681		$	1,711		$	1,166
	As of December 31, 2014, there was $2.5 million of total unrecognized stock-based compensation related to non-vested share-based compensation awards granted under the stock option plans. This cost is expected to be recognized over a weighted average period of 1.5 years.
	We used the BSOPM to determine the fair value of option grants made during 2013 and 2012. No options were granted in 2014. On January 1, 2006, we elected to use the “simplified” method to calculate the estimated life of options granted to employees. The Company continued to use the “simplified” method for all options granted through 2013. The Company has elected to use the “historical” method to calculate the estimated life of any options that may be granted in the future. The expected stock price volatility was calculated by averaging the historical volatility of the Company’s common stock over a term equal to the expected life of the options.
	The following weighted average assumptions were applied in determining the fair value of options granted during the respective periods:
		Year Ended December 31,
		2014			2013			2012
	Risk-free interest rate		—			1.05	%		0.92	%
	Expected option life (years)		—			5.8			6
	Expected stock price volatility		—			69	%		74	%
	Expected dividend yield		—			—			—
	Fair value of options granted		—		$	1.99		$	1.72
	The assumptions used in the BSOPM valuation are critical as a change in any given factor could have a material impact on the financial results of the Company. The weighted average grant-date fair value of awards of restricted stock and RSU’s is based on quoted market price of the Company’s common stock on the date of grant.
	Stock Option Activity
	There were 407,829 stock options exercised for the twelve months ended December 31, 2014. As a result of these stock option exercises, there was $99 thousand in excess tax benefits recorded in 2014. For the comparative period in 2013, there were 839,263 stock option exercises. A deferred tax asset totaling $236 thousand and $321 thousand resulting from stock-based compensation expenses was recorded for the twelve months ended December 31, 2014 and 2013, respectively.
	The following is a summary of all stock option transactions for the three years ended December 31, 2014:
		Shares			Weighted			Weighted
					Average			Average
					Exercise			Remaining
					Price			Contractual
								Term (Yrs)
	Outstanding at January 1, 2012		7,147,450		$	4.48
	Granted at market price		1,099,000		$	2.69
	Cancelled or expired		(386,706	)	$	4.69
	Exercised		(174,968	)	$	1.76
	Outstanding at December 31, 2012		7,684,776		$	4.28
	Granted at market price		150,000		$	3.27
	Cancelled or expired		(247,139	)	$	5.15
	Exercised		(839,263	)	$	2.03
	Outstanding at December 31, 2013		6,748,374		$	4.5
	Granted at market price		—			—
	Cancelled or expired		(1,850,036	)	$	7.71
	Exercised		(407,829	)	$	1.83
	Outstanding at December 31, 2014		4,490,509		$	3.42			3.96
	Options exercisable at December 31, 2014		4,135,731		$	3.49			3.67
	At December 31, 2014, we had 2,207,201 options outstanding and 1,852,423 options exercisable in which the exercise price was lower than the market value of the Company’s common stock. The aggregate intrinsic value of these options was $2.4 million and $2.1 million, respectively. At December 31, 2013, we had 4,110,030 options outstanding and 3,270,154 options exercisable in which the exercise price was lower than the market value of the Company’s common stock. The aggregate intrinsic value of these options was $6.6 million and $5.2 million, respectively.
	The total intrinsic value of options exercised during the years ended December 31, 2014 and 2013, was $716 thousand and $1.9 million, respectively.
Summarized information about stock options outstanding at December 31, 2014, is as follows:
	Options Outstanding									Options Exercisable
Range of Exercise Prices	Number			Weighted Average			Weighted			Number		Weighted
	Outstanding			Remaining			Average			Exercisable		Average
				Contractual Life			Exercise Price					Exercise Price
$1.11 - $1.99		400,553			2.64		$	1.46			400,553	$	1.46
$2.00 - $3.49		1,806,648			5.57		$	2.73			1,451,870	$	2.74
$3.50 - $4.99		2,283,308			2.92		$	4.32			2,283,308	$	4.32
		4,490,509			3.96		$	3.42			4,135,731	$	3.49
There were 5,908,498 and 6,412,505 exercisable options at December 31, 2013 and 2012, respectively.
Restricted Stock Activity
The following is a summary of all restricted stock activity during the three years ended December 31, 2014:
	Restricted			Weighted
	Shares			Average
				Fair Value
Outstanding at January 1, 2012		—			—
Granted at market price		351,000		$	2.49
Vested		—			—
Cancelled		—			—
Unvested restricted stock at December 31, 2012		351,000		$	2.49
Granted at market price		385,000		$	3.45
Vested		(87,750	)	$	2.49
Cancelled		—			—
Unvested restricted stock at December 31, 2013		648,250		$	3.06
Granted at market price		140,000		$	4.66
Vested		(184,000	)	$	2.99
Cancelled		—			—
Unvested restricted stock at December 31, 2014		604,250		$	3.45
As a result of these vesting RSA’s a $69 thousand in excess tax benefits recorded in 2014. A deferred tax asset totaling $227 thousand resulting from stock-based compensation expenses was also recorded for the twelve month period.
Restricted Stock Unit Activity
The following is a summary of all RSU activity during the three years ended December 31, 2014:
	Restricted			Weighted
	Stock Units			Average
				Fair Value
Non-vested at January 1, 2012		—			—
Granted at market price		113,000		$	2.49
Vested		—			—
Cancelled		—			—
Unvested restricted stock units at December 31, 2012		113,000		$	2.49
Granted at market price		95,000		$	3.45
Vested		(28,250	)	$	2.49
Cancelled		—			—
Unvested restricted stock units at December 31, 2013		179,750		$	3
Granted at market price		55,000		$	4.66
Vested		(52,000	)	$	2.93
Cancelled		—			—
Unvested restricted stock units at December 31, 2014		182,750		$	3.52
Performance Unit Activity
The following is a summary of all PU activity during the twelve month period ended December 31, 2014:
	Restricted			Weighted
	Stock Units			Average
				Fair Value
Non-vested at January 1, 2014		—			—
Granted at market price		100,000		$	4.66
Vested		—			—
Forfeited		100,000		$	4.66
Unvested restricted stock units at December 31, 2014		—			—
The weighted average grant-date fair value of awards of restricted stock and RSUs (collectively “restricted stock”) and PUs is based on the quoted market price of the Company’s common stock on the date of grant.

Supplemental_Cash_Flow_Informa

Supplemental Cash Flow Information	12 Months Ended
	Dec. 31, 2014
Supplemental Cash Flow Elements [Abstract]
Supplemental Cash Flow Information	4. Supplemental Cash Flow Information
	Supplemental information relating to taxes and noncash activities:
		Year Ended December 31,
	(In thousands)	2014			2013			2012
	Income tax payments	$	426		$	217		$	350
	Payables related to purchases of capitalized assets	$	(12	)	$	(97	)	$	34
	Excess tax benefit on exercise and vesting of employee equity awards	$	168		$	427		$	10

Receivables_net

Receivables, net	12 Months Ended
	Dec. 31, 2014
Receivables [Abstract]
Receivables, net	5. Receivables, net
	(In thousands)	December 31,
		2014			2013
	Gross accounts receivables	$	8,116		$	8,359
	Allowance for returns and doubtful accounts		(108	)		(46	)
	Unpaid portion of deferred revenue		(6,556	)		(5,989	)
	Note receivable		458			458
	Allowance for note receivable		(458	)		(458	)
	Receivables, net	$	1,452		$	2,324
	Our gross accounts receivables for the years ended 2014 and 2013 included $318 thousand and $ 863 thousand, respectively, associated with a tenant improvement allowance received as an incentive when we renewed the lease for our Dallas headquarters in 2013.
	The allowance for doubtful accounts includes all specific accounts receivable which we believe are likely not collectable based on known information. In addition, we record 2.5% of all accounts receivable greater than 90 days past due, net of those accounts specifically reserved, as a general allowance against accounts that could potentially become uncollectible.
	The reduction for deferred revenue represents future customer service or maintenance obligations which have been billed to customers, but remain unpaid as of the respective balance sheet dates. Deferred revenue on our consolidated balance sheets represents future customer service or maintenance obligations which have been billed and collected as of the respective balance sheet dates.
	The note receivable represents the remaining outstanding balance of an original note related to the sale of a product line in 2005 in the amount of $540 thousand. This was fully reserved at the time of the sale as the note’s collectability was not assured. The note receivable is fully reserved at December 31, 2014.

Prepaid_and_other_current_asse

Prepaid and other current assets	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Prepaid and other current assets	6. Prepaid and other current assets
	(In thousands)	December 31,
		2014			2013
	Prepaid insurance, maintenance, software licenses and other	$	1,954		$	1,489
	Deferred commissions		443			320
	Deferred rent		—			261
	Tax-related		(25	)		(32	)
	Prepaid and other current assets	$	2,372		$	2,038

Property_and_Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Property and Equipment	7. Property and Equipment
	(In thousands)	December 31,
		2014			2013
	Computer and office equipment and software	$	23,013		$	22,550
	Leasehold improvements		6,398			5,276
	Furniture and fixtures		1,916			1,520
			31,327			29,346
	Less accumulated depreciation and amortization		(26,928	)		(26,738	)
	Total Property and Equipment	$	4,399		$	2,608
	Our operations include depreciation and amortization expense related to property and equipment of $1.6 million, $1.5 million, and $1.3 million in 2014, 2013, and 2012, respectfully.

Goodwill

Goodwill	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	8. Goodwill
	At December 31, 2014 and 2013, we had goodwill totaling $2.2 million. We evaluate goodwill for impairment annually in the fourth quarter, or when there is reason to believe that the value has been diminished or impaired. There were no impairment indicators to the goodwill recorded as of December 31, 2014.

Accrued_Expenses

Accrued Expenses	12 Months Ended
	Dec. 31, 2014
Payables and Accruals [Abstract]
Accrued Expenses	9. Accrued Expenses
		December 31,
	(In thousands)	2014		2013
	Employee compensation and benefits	$	1,061	$	872
	Professional fees		473		469
	Taxes		378		350
	Other		1,018		301
	Total accrued expenses	$	2,930	$	1,992

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value Measurements	10. Fair Value Measurements
	FASB guidance regarding fair value measurement establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include: Level 1, defined as observable inputs such as quoted prices in active markets for identical assets or liabilities; Level 2, defined as inputs other than quoted prices for similar assets and liabilities in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs for which little or no market data exists, therefore requiring an entity to develop its own assumptions.
	For certain of the Company’s financial instruments, including cash and cash equivalents, trade receivables, and accounts payable, the fair values approximate carrying values due to the short-term maturities of these instruments. The carrying values of other current assets and accrued expenses are also not recorded at fair value, but approximate fair values primarily due to their short-term nature.

Earnings_Per_Share_and_Potenti

Earnings Per Share and Potential Dilution	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Earnings Per Share and Potential Dilution	11. Earnings Per Share and Potential Dilution
	Basic earnings per share are computed using the weighted average number of common shares outstanding for the period. The dilutive effect of potential common shares outstanding is included in diluted earnings per share. The computations for basic and diluted earnings per share for the years ended December 31, 2014, 2013, and 2012, are as follows:
		Year Ended December 31,
		2014		2013		2012
	Basic weighted average shares		57,948,864		61,139,035		62,211,228
	Effect of dilutive securities:
	Employee and director stock options		782,659		1,095,227		637,676
	Restricted Stock		181,219		225,741		20,003
	RSUs		53,832		66,504		6,440
	PUs		51		—		—
	Potential dilutive common shares		58,966,625		62,526,507		62,875,347
	For the years ended December 31, 2014, 2013, and 2012, weighted average shares related to certain stock options of 3,240,594, 4,054,261, and 5,645,239 respectively, were excluded from the calculation of diluted earnings per share because the stock options were anti-dilutive. Anti-dilutive restricted stock, RSUs, and PUs of 147,292, 50,833, and 33,333, respectively, were also excluded from the calculation for the year ended December 31, 2014. Anti-dilutive restricted stock and RSUs of 31,281, and 7,719, respectively, were excluded from the calculation for the year ended December 31, 2013.

Significant_Customers

Significant Customers	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Significant Customers	12. Significant Customers
	In 2014, 2013, and 2012, no single customer accounted for 10% or more of our revenues. Our accounts receivable balance at December 31, 2012, included receivables from one customer comprising 12% of the net total. These receivables were paid to the Company in the first quarter 2013.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	13. Commitments and Contingencies
	Leases
	We lease office facilities under non-cancelable operating lease agreements. Our operations include rent expense for these operating leases of $1.4 million in 2014 and $1.3 million in each of 2013 and 2012, respectively. The term of the lease of our headquarter facility in Dallas was extended to 2024.
	A summary of our fixed contractual obligations and commitments at December 31, 2014, is as follows:
	(In thousands)	2015		2016		2017		2018		2019		Thereafter		Total
	Operating leases	$	1,433	$	1,172	$	1,064	$	1,014	$	1,030	$	5,160	$	10,873
	Claims and Proceedings
	We are subject to legal proceedings, claims, and litigation against our business. While the outcome of these matters is currently not determinable and the costs and expenses of defending these matters may be significant, we currently do not expect that the ultimate costs to resolve these matters will have a material adverse effect on our consolidated financial statements.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	14. Income Taxes
	Components of the income taxes are as follows:
	(In thousands)	2014			2013			2012
	Current:
	U.S.	$	67		$	124		$	116
	State		240			148			164
	Foreign		125			123			66
	Deferred
	Federal		2,396			(1,400	)		(2,300	)
	State		—			—			—
	Foreign		2			(1	)		5
	Income tax expense (benefit)	$	2,830		$	(1,006	)	$	(1,949	)
	A reconciliation of the expected U.S. tax expense (benefit) to income taxes is as follows:
	(In thousands)	2014			2013			2012
	Expected tax (benefit) expense at U.S. statutory rate	$	2,357		$	3,212		$	3,078
	Decrease in valuations allowance - Operations		—			(2,650	)		(2,912	)
	Decrease in valuations allowance - Other		—			(1,400	)		(2,300	)
	Nondeductible expense and nontaxable income		127			(370	)		21
	State income taxes		224			98			108
	Foreign income taxes		127			122			71
	Other		(5	)		(18	)		(15	)
	Income tax expense (benefit)	$	2,830		$	(1,006	)	$	(1,949	)
	Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Components of our deferred income taxes as of December 31, 2014 and 2013 are as follows:
	(In thousands)	2014			2013
	Deferred tax assets:
	Reserves - Other	$	325		$	251
	U.S. net operating loss carryforwards		86,382			88,562
	State net operating loss carryforwards		281			347
	Tax credit carryforwards		5,863			5,619
	Stock-based compensation		2,623			2,839
	Intangible assets		538			978
	Depreciable assets		1,461			1,430
	Other assets		712			649
	Total deferred tax assets		98,185			100,675
	Deferred tax liabilities:
	Prepaid expenses		(496	)		(418	)
	Total deferred tax assets		97,689			100,257
	Less valuation allowance		(46,038	)		(46,209	)
	Net deferred tax assets	$	51,651		$	54,048
	The Company has partially reserved its U.S. net deferred tax assets in 2014 and 2013 due to the uncertainty of future taxable income. The Company has U.S. net operating loss carryforwards of approximately $254 million which begin to expire in 2020. The Company has state credits that net of federal tax expense total $1.7 million which can be utilized through 2027 and state net operating losses that have various expiration dates. The Company also has tax credit carryforwards of approximately $4.1 million consisting of business tax credits which begin to expire in 2015 and alternative minimum tax credits which do not expire.
	In 2010, the Company achieved positive earnings and successfully discontinued operations of its e-Prescribing segment. Based on the weight of available objective evidence, including the Company’s history of positive earnings from continuing operations and successful exit from e-Prescribing, management believed that it was more likely than not that a portion of the deferred tax asset would be realized. Accordingly, the Company reduced its valuation allowance by $4.1 million in 2013 and $5.2 million in 2012.
	We have determined that utilization of existing net operating losses against future taxable income is not limited by Section 382 of the Internal Revenue Code. Future ownership changes, however, may limit the company’s ability to fully utilize its existing net operating loss carryforwards against any future taxable income.
	The Company or one of our subsidiaries files income tax returns in the U.S. federal jurisdiction and various states and in the Canadian federal and provincial jurisdictions. We have not taken a tax position that, if challenged, would have a material effect on the financial statements or the effective tax rate for the twelve-months ended December 31, 2014, or during the prior three years. We have determined it is not reasonably possible for the amounts of unrecognized tax benefits to significantly increase or decrease within the next twelve months. We are currently subject to a three-year statute of limitations by major tax jurisdictions.

Employee_Benefit_Plan

Employee Benefit Plan	12 Months Ended
	Dec. 31, 2014
Postemployment Benefits [Abstract]
Employee Benefit Plan	15. Employee Benefit Plan
	401(k) Plan — We have a retirement savings plan structured under Section 401(k) of the Internal Revenue Code covering substantially all of our U.S. employees. Under the plan, contributions are voluntarily made by employees, and we may provide contributions based on the employees’ contributions. Our operating income includes $354 thousand, $297 thousand, and $221 thousand, in 2014, 2013, and 2012, respectively, for net contributions from operations to this plan.

ZixCorp_Repurchase_Program

ZixCorp Repurchase Program	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
ZixCorp Repurchase Program	16. ZixCorp Repurchase Program
	During the year ended December 31, 2014, we repurchased a total of 4,070,195 shares at an aggregate cost of $16.2 million, as authorized by our board of directors under a $15 million share repurchase program announced November 6, 2013, and a $10 million repurchase program announced July 30, 2014. The 2014 repurchase activity completed both programs.
	During the year ended December 31, 2013, we repurchased 1,976,900 shares at an aggregate cost of $8.8 million under the $15 million repurchase program announced November 2013.
	During the year ended December 31, 2012, we repurchased 3,080,966 shares valued at approximately $9 million. This completed a $15 million share repurchase program authorized by our board of directors announced November 9, 2011.

Quarterly_Results_of_Operation

Quarterly Results of Operations (Unaudited)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Quarterly Results of Operations (Unaudited)	17. Quarterly Results of Operations (Unaudited)
	The following is a summary of the quarterly results of operations for the years ended December 31, 2014 and 2013:
			Quarter Ended
	(In thousands except per share data)		March 31		June 30		September 30		December 31
	2014
	Revenues		$	12,162	$	12,615	$	12,705	$	12,865
	Gross margin			10,137		10,583		10,643		10,660
	Net income			1,059		977		1,163		904
	Basic net income per common share*			0.02		0.02		0.02		0.02
	Diluted net income per common share*			0.02		0.02		0.02		0.02
	2013
	Revenues		$	11,764	$	11,838	$	12,225	$	12,311
	Gross margin			9,828		9,935		10,321		10,440
	Net income			567		1,871		3,175		4,840
	Basic net income per common share*			0.01		0.03		0.05		0.08
	Diluted net income per common share*			0.01		0.03		0.05		0.08
	*	Net income per share is calculated independently for each quarter. The sum of Net income per share for each quarter may not equal the total Net income per share for the year due to rounding differences.

Subsequent_Events

Subsequent Events	12 Months Ended
	Dec. 31, 2014
Subsequent Events [Abstract]
Subsequent Events	18. Subsequent Events
	On January 6, 2015, the Company’s board of directors approved a share repurchase program that enables the Company to purchase up to $10 million of its shares of common stock. The amount and timing of specific repurchases are subject to market conditions, applicable legal requirements and other factors. Any share purchases would be funded from existing cash resources and may be suspended or discontinued at any time. The share repurchase program will expire on July 31, 2015.
	On March 4, 2015, the Company entered into a Strategic Relationship Agreement (“SRA”) with Cisco Systems, Inc. (“Cisco”). The SRA provides for the Company to develop email encryption solutions to be distributed by Cisco. The contemplated solutions in this OEM-type relationship include an enhanced Cisco IronPort Encryption Applicance (“IEA”), which is expected to be commercially available May 2015, and versions of the Company’s ZixGateway appliance and service that would include Cisco’s Post X Envelope (PXE) delivery method as an option.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation — The accompanying consolidated financial statements include the accounts of all our wholly-owned subsidiaries and are prepared in accordance with accounting principles generally accepted in the United States of America. All inter-company accounts and transactions have been eliminated in consolidation.
Use of Estimates	Use of Estimates — The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenue and expenses during the reported period. Our significant estimates include primarily those required in the valuation or impairment analysis of goodwill, property and equipment, revenue recognition, allowances for doubtful accounts, stock-based compensation, litigation accruals, valuation allowances for deferred tax assets and tax accruals. Although we believe that adequate accruals have been made for unsettled issues, additional gains or losses could occur in future years from resolutions of outstanding matters. Actual results could differ materially from original estimates.
Cash Equivalents	Cash Equivalents — Cash investments with maturities of three months or less when purchased are considered cash equivalents.
Fair Value of Financial Instruments	Fair Value of Financial Instruments —The Company does not measure the fair value of any financial instrument other than cash equivalents, options, and other equity awards. The carrying values of other financial instruments (receivables and accounts payable) are not recorded at fair value but approximate fair values primarily due to their short-term nature. The carrying values of other current assets and accrued expenses are also not recorded at fair value, but approximate fair values primarily due to their short-term nature.
Valuation of Property and Equipment	Valuation of Property and Equipment — The accounting policies and estimates relating to property and equipment are considered significant because of the potential impact that impairment, obsolescence, or change in an asset’s useful life could have on the Company’s operating results.
	We record an impairment charge on the assets to be held and used when we determine based upon certain triggering events that the carrying value of property and equipment may not be recoverable based on expected undiscounted cash flows attributable to such assets. The amount of a potential impairment is determined by comparing the carrying amount of the asset to either the value determined from a projected discounted cash flow method, using a discount rate that is considered to be commensurate with the risk inherent in the Company’s current business model or the estimated fair market value. Assumptions are made with respect to future net cash flows expected to be generated by the related asset. An impairment charge would be recorded for an amount by which the carrying value of the asset exceeded the discounted projected net cash flows or estimated fair market value. Also, even where a current impairment charge is not necessary, the remaining useful lives are evaluated. No impairment was recorded for any of the periods presented.
	Property and equipment are recorded at cost and depreciated or amortized using the straight-line method over their estimated useful lives as follows: computer and office equipment and software — three years; leasehold improvements — the shorter of five years or the lease term; and furniture and fixtures — five years.
Goodwill	Goodwill — We account for the valuation of goodwill and other intangible assets after classifying intangible assets into three categories: (1) intangible assets with finite lives subject to amortization; (2) intangible assets with indefinite lives not subject to amortization; and (3) goodwill. For intangible assets with finite lives, tests for impairment must be performed if conditions exist that indicate the carrying value may not be recoverable. For intangible assets with indefinite lives and goodwill, tests for impairment must be performed at least annually or more frequently if events or circumstances indicate that assets might be impaired.
	Goodwill was $2.2 million, or 3% and 2% of total assets for the years ended December 31, 2014 and 2013, respectively.
	Our goodwill is not being amortized, but we do evaluate the goodwill for impairment annually in the fourth quarter, or when there is reason to believe that the value has been diminished or impaired. Evaluations for possible impairment are based upon a comparison of the estimated fair value of the reporting unit to which the goodwill has been assigned, versus the sum of the carrying value of the assets and liabilities of that unit including the assigned goodwill value. The fair values used in this evaluation are estimated based on the Company’s market capitalization, which is based on the outstanding stock and market price of the stock. Impairment is deemed to exist if the net book value of the unit exceeds its estimated fair value. No impairment was recorded for any of the periods presented.
Deferred Tax Assets	Deferred Tax Assets — Deferred tax assets are recognized if it is “more likely than not” that the benefit of the deferred tax asset will be realized on future federal or state income tax returns. At December 31, 2014, we provided a valuation allowance against a significant portion, $46.0 million, of our accumulated U.S. deferred tax assets, reflecting our historical losses and the uncertainty of future taxable income sufficient to utilize net operating loss carryforwards prior to their expiration. Our total deferred tax asset not subject to a valuation allowance is valued at $51.7 million, and consists of $43.5 million for federal net operating loss carryforwards, $5.2 million relating to temporary timing differences between GAAP and tax-related expense, $1.9 million relating to U.S. state income tax credits and $1.1 million related to Alternative Minimum Tax credits. If U.S. taxable income increases from its current level in a future period or if the facts and circumstances on which our estimates and assumptions are based were to change, thereby impacting the likelihood of realizing the deferred tax assets, judgment would have to be applied in determining the amount of valuation allowance no longer required. Reversal of all or a part of this valuation allowance could have a significant positive impact on operating results in the period that it becomes more likely than not that certain of the Company’s deferred tax assets will be realized. Alternatively, should our future income decrease from current levels, a resulting increase to all or a part of this valuation allowance could also have a significant negative impact on our operating results.
Leases	Leases — A leased asset whose lease terms meet the criteria for capitalization is recorded as an asset and depreciated. If a lease does not meet the criteria for capitalization, it is classified as an operating lease and payments are recorded as rent expense. For 2014 and 2013 we had no leases that qualified as capital leases. Lease renewal options which we are “reasonably assured” of using and the related payments are taken into account when initially classifying and recording the lease as a capital lease obligation or as straight-line rent if an operating lease. Funds provided by the lessor for leasehold improvements are recorded as a deferred lease incentive and amortized as a reduction of rent expense over the lease term.
Revenue Recognition	Revenue Recognition — We develop, market, and support applications that connect, protect and deliver information in a secure manner. Our services can be placed into several key revenue categories where each category has similar revenue recognition traits: Email Encryption, DLP, and BYOD email subscription-based services, various transaction fees and related professional services. The majority of the revenues generated are through a combination of direct sales and a network of resellers and other distribution partners.
	Under all product categories and distribution models, we recognize revenue after all of the following occur:
		•	persuasive evidence of an arrangement exists,
		•	delivery has occurred or services have been rendered,
		•	the price is fixed and determinable, and
		•	collectability is reasonably assured.
	Discounts provided to customers are recorded as reductions in revenue.
	Our Email Encryption, DLP and BYOD services are subscription services. Providing these services includes delivering subscribed-for software and providing secure electronic communications and customer support throughout the subscription period. Our subscribers generally execute multiple-year contracts that are irrevocable and non-refundable in nature and require annual, up-front payments. Subscription fees received from customers are initially recorded as deferred revenue and then recognized as revenue ratably over the subscription period. We do not offer stand alone services. Further, our services primarily include manufacturer provided warranty provisions. We recorded no warranty expense in any of the presented periods.
Software Development Costs	Software Development Costs — Costs incurred in the development and testing of software used in the Company’s Email Encryption, DLP, and BYOD email services related to research, project planning, training, maintenance and general and administrative activities, and overhead costs are expensed as incurred. The costs of relatively minor upgrades and enhancements to the software are also expensed as incurred.
	Costs for the development of new software solutions and substantial enhancements to existing software solutions are expensed as incurred until technological feasibility has been established, at which time any additional costs would be capitalized. No research and development costs have been capitalized because we believe that technological feasibility is established concurrent with general release to customers.
Advertising Expense	Advertising Expense — Advertising costs are expensed as incurred. Our operations include advertising expense of $2.9 million, $959 thousand, and $538 thousand in 2014, 2013, and 2012, respectively.
Stock-Based Compensation	Stock-Based Compensation — We currently use the straight-line amortization method for recognizing stock option and restricted stock compensation costs. The measurement and recognition of compensation expense for all share-based payment awards made to our employees, directors or outside service providers are based on the estimated fair value of the awards on the grant dates. The grant date fair value is estimated using either an option-pricing model which is consistent with the terms of the award or a market observed price, if such a price exists. Such cost is recognized over the period during which an employee, director or outside service provider is required to provide service in exchange for the award, i.e., “the requisite service period” (which is usually the vesting period). We also estimate the number of instruments that will ultimately be earned, rather than accounting for forfeitures as they occur.
Earnings Per Share ("EPS")	Earnings Per Share (“EPS”) — Basic EPS is based on the weighted average number of common shares outstanding during each period. Diluted EPS adjusts Basic EPS for the effects of dilutive common stock equivalents outstanding during each period using the treasury stock method.
New Accounting Standards	New Accounting Standards
	Revenue Recognition
	In May 2014, the FASB issued Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (ASU 2014-09), which supersedes most current revenue recognition guidance under U.S. GAAP. The core principle of ASU 2014-09 is to recognize revenues when promised goods or services are transferred to customers in an amount that reflects the consideration to which an entity expects to be entitled for those goods or services. ASU 2014-09 defines a five step process to achieve this core principle and, in doing so, more judgment and estimates may be required within the revenue recognition process than are required under existing U.S. GAAP.
	The standard is effective for us beginning 2017, and requires using either of the following transition methods: (i) a full retrospective approach reflecting the application of the standard in each prior reporting period with the option to elect certain practical expedients, or (ii) a retrospective approach with the cumulative effect of initially adopting ASU 2014-09 recognized at the date of adoption (which includes additional footnote disclosures). We are currently evaluating the impact of our pending adoption of ASU 2014-09 on our consolidated financial statements and have not yet determined the method by which we will adopt the standard in 2017.
	Unrecognized Tax Benefit
	In July 2013, the FASB issued guidance that requires entities to present unrecognized tax benefits (UTB) in the financial statements as a reduction to a deferred tax asset (DTA) for a net operating loss (NOL) carryforward when NOL’s exist. Entities whose NOL carryforwards are not available to settle taxes that would result from the disallowance of the tax position, or who do not intend to use their DTA for that purpose, should present their UTB as a liability and should not net the UTB with the DTA. The guidance became effective for us at the beginning of 2014. This new guidance did not have a material impact on our consolidated financial statements.
Fair Value Measurements	FASB guidance regarding fair value measurement establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include: Level 1, defined as observable inputs such as quoted prices in active markets for identical assets or liabilities; Level 2, defined as inputs other than quoted prices for similar assets and liabilities in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs for which little or no market data exists, therefore requiring an entity to develop its own assumptions.
	For certain of the Company’s financial instruments, including cash and cash equivalents, trade receivables, and accounts payable, the fair values approximate carrying values due to the short-term maturities of these instruments. The carrying values of other current assets and accrued expenses are also not recorded at fair value, but approximate fair values primarily due to their short-term nature.

Stock_Options_and_Stockbased_E1

Stock Options and Stock-based Employee Compensation (Tables)	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Common Stock Options	Below is a summary of common stock options outstanding at December 31, 2014:
		Authorized			Options			Options			Available
		Shares			Outstanding			Vested			for Grant
	Employee and Director Stock Option Plans:
	1995 Long-term Incentive Plan		1,825,000			350,000			350,000			—
	2001 Stock Option Plan		2,525,000			428,296			428,296			—
	2001 Employee Stock Option Plan		300,000			12,860			12,860			—
	2003 New Employee Stock Option Plan		500,000			12,000			12,000			—
	2004 Stock Option Plan		5,000,000			2,706,353			2,665,514			—
	2004 Director’s Stock Option Plan		300,000			65,000			65,000			—
	2006 Director’s Stock Option Plan		1,100,000			255,500			255,500			—
	2012 Incentive Plan		2,700,000			660,500			346,561			839,404
	Total		14,250,000			4,490,509			4,135,731			839,404
Summary of Stock-based Employee Compensation Expense	For the twelve months ended December 31, 2014, 2013, and 2012, respectively, the total stock-based compensation expense resulting from stock options, RSAs, RSUs, and PUs was recorded to the following line items of our consolidated statement of income:
		Year Ended December 31,
	(In thousands)	2014			2013			2012
	Cost of revenue	$	180		$	172		$	136
	Research and development expenses		237			212			142
	Selling, general and administrative expenses		1,264			1,327			888
	Stock-based compensation expense	$	1,681		$	1,711		$	1,166
Schedule of Fair Value Option Award	The following weighted average assumptions were applied in determining the fair value of options granted during the respective periods:
		Year Ended December 31,
		2014			2013			2012
	Risk-free interest rate		—			1.05	%		0.92	%
	Expected option life (years)		—			5.8			6
	Expected stock price volatility		—			69	%		74	%
	Expected dividend yield		—			—			—
	Fair value of options granted		—		$	1.99		$	1.72
Summary of All Stock Option Transactions	The following is a summary of all stock option transactions for the three years ended December 31, 2014:
		Shares			Weighted			Weighted
					Average			Average
					Exercise			Remaining
					Price			Contractual
								Term (Yrs)
	Outstanding at January 1, 2012		7,147,450		$	4.48
	Granted at market price		1,099,000		$	2.69
	Cancelled or expired		(386,706	)	$	4.69
	Exercised		(174,968	)	$	1.76
	Outstanding at December 31, 2012		7,684,776		$	4.28
	Granted at market price		150,000		$	3.27
	Cancelled or expired		(247,139	)	$	5.15
	Exercised		(839,263	)	$	2.03
	Outstanding at December 31, 2013		6,748,374		$	4.5
	Granted at market price		—			—
	Cancelled or expired		(1,850,036	)	$	7.71
	Exercised		(407,829	)	$	1.83
	Outstanding at December 31, 2014		4,490,509		$	3.42			3.96
	Options exercisable at December 31, 2014		4,135,731		$	3.49			3.67
Summarized Information about Stock Options Outstanding by Range of Exercise Prices	Summarized information about stock options outstanding at December 31, 2014, is as follows:
		Options Outstanding									Options Exercisable
	Range of Exercise Prices	Number			Weighted Average			Weighted			Number		Weighted
		Outstanding			Remaining			Average			Exercisable		Average
					Contractual Life			Exercise Price					Exercise Price
	$1.11 - $1.99		400,553			2.64		$	1.46			400,553	$	1.46
	$2.00 - $3.49		1,806,648			5.57		$	2.73			1,451,870	$	2.74
	$3.50 - $4.99		2,283,308			2.92		$	4.32			2,283,308	$	4.32
			4,490,509			3.96		$	3.42			4,135,731	$	3.49
Summary of All Restricted Stock Activity	The following is a summary of all restricted stock activity during the three years ended December 31, 2014:
		Restricted			Weighted
		Shares			Average
					Fair Value
	Outstanding at January 1, 2012		—			—
	Granted at market price		351,000		$	2.49
	Vested		—			—
	Cancelled		—			—
	Unvested restricted stock at December 31, 2012		351,000		$	2.49
	Granted at market price		385,000		$	3.45
	Vested		(87,750	)	$	2.49
	Cancelled		—			—
	Unvested restricted stock at December 31, 2013		648,250		$	3.06
	Granted at market price		140,000		$	4.66
	Vested		(184,000	)	$	2.99
	Cancelled		—			—
	Unvested restricted stock at December 31, 2014		604,250		$	3.45
Summary of All Restricted Stock Unit Activity	The following is a summary of all RSU activity during the three years ended December 31, 2014:
		Restricted			Weighted
		Stock Units			Average
					Fair Value
	Non-vested at January 1, 2012		—			—
	Granted at market price		113,000		$	2.49
	Vested		—			—
	Cancelled		—			—
	Unvested restricted stock units at December 31, 2012		113,000		$	2.49
	Granted at market price		95,000		$	3.45
	Vested		(28,250	)	$	2.49
	Cancelled		—			—
	Unvested restricted stock units at December 31, 2013		179,750		$	3
	Granted at market price		55,000		$	4.66
	Vested		(52,000	)	$	2.93
	Cancelled		—			—
	Unvested restricted stock units at December 31, 2014		182,750		$	3.52
Summary of All Performance Unit Activity	The following is a summary of all PU activity during the twelve month period ended December 31, 2014:
		Restricted			Weighted
		Stock Units			Average
					Fair Value
	Non-vested at January 1, 2014		—			—
	Granted at market price		100,000		$	4.66
	Vested		—			—
	Forfeited		100,000		$	4.66
	Unvested restricted stock units at December 31, 2014		—			—

Supplemental_Cash_Flow_Informa1

Supplemental Cash Flow Information (Tables)	12 Months Ended
	Dec. 31, 2014
Supplemental Cash Flow Elements [Abstract]
Supplemental Cash Flow Information Relating to Taxes and Non-Cash Activities	Supplemental information relating to taxes and noncash activities:
		Year Ended December 31,
	(In thousands)	2014			2013			2012
	Income tax payments	$	426		$	217		$	350
	Payables related to purchases of capitalized assets	$	(12	)	$	(97	)	$	34
	Excess tax benefit on exercise and vesting of employee equity awards	$	168		$	427		$	10

Receivables_net_Tables

Receivables, net (Tables)	12 Months Ended
	Dec. 31, 2014
Receivables [Abstract]
Summary of Net Receivables	(In thousands)	December 31,
		2014			2013
	Gross accounts receivables	$	8,116		$	8,359
	Allowance for returns and doubtful accounts		(108	)		(46	)
	Unpaid portion of deferred revenue		(6,556	)		(5,989	)
	Note receivable		458			458
	Allowance for note receivable		(458	)		(458	)
	Receivables, net	$	1,452		$	2,324

Prepaid_and_other_current_asse1

Prepaid and other current assets (Tables)	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Schedule of Prepaid and Other Current Assets
		December 31,
	(In thousands)	2014			2013
	Prepaid insurance, maintenance, software licenses and other	$	1,954		$	1,489
	Deferred commissions		443			320
	Deferred rent		—			261
	Tax-related		(25	)		(32	)
	Prepaid and other current assets	$	2,372		$	2,038

Property_and_Equipment_Tables

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Summary of Property and Equipment	(In thousands)	December 31,
		2014			2013
	Computer and office equipment and software	$	23,013		$	22,550
	Leasehold improvements		6,398			5,276
	Furniture and fixtures		1,916			1,520
			31,327			29,346
	Less accumulated depreciation and amortization		(26,928	)		(26,738	)
	Total Property and Equipment	$	4,399		$	2,608

Accrued_Expenses_Tables

Accrued Expenses (Tables)	12 Months Ended
	Dec. 31, 2014
Payables and Accruals [Abstract]
Summary of Accrued Expenses
		December 31,
	(In thousands)	2014		2013
	Employee compensation and benefits	$	1,061	$	872
	Professional fees		473		469
	Taxes		378		350
	Other		1,018		301
	Total accrued expenses	$	2,930	$	1,992

Earnings_Per_Share_and_Potenti1

Earnings Per Share and Potential Dilution (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Computations of Basic and Diluted Earnings Per Share	The computations for basic and diluted earnings per share for the years ended December 31, 2014, 2013, and 2012, are as follows:
		Year Ended December 31,
		2014		2013		2012
	Basic weighted average shares		57,948,864		61,139,035		62,211,228
	Effect of dilutive securities:
	Employee and director stock options		782,659		1,095,227		637,676
	Restricted Stock		181,219		225,741		20,003
	RSUs		53,832		66,504		6,440
	PUs		51		—		—
	Potential dilutive common shares		58,966,625		62,526,507		62,875,347

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Summary of Fixed Contractual Obligations and Commitments	A summary of our fixed contractual obligations and commitments at December 31, 2014, is as follows:
	(In thousands)	2015		2016		2017		2018		2019		Thereafter		Total
	Operating leases	$	1,433	$	1,172	$	1,064	$	1,014	$	1,030	$	5,160	$	10,873

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Components of Income Taxes	Components of the income taxes are as follows:
	(In thousands)	2014			2013			2012
	Current:
	U.S.	$	67		$	124		$	116
	State		240			148			164
	Foreign		125			123			66
	Deferred
	Federal		2,396			(1,400	)		(2,300	)
	State		—			—			—
	Foreign		2			(1	)		5
	Income tax expense (benefit)	$	2,830		$	(1,006	)	$	(1,949	)
Schedule of Reconciliation of Tax Expense Benefit to Income Taxes	A reconciliation of the expected U.S. tax expense (benefit) to income taxes is as follows:
	(In thousands)	2014			2013			2012
	Expected tax (benefit) expense at U.S. statutory rate	$	2,357		$	3,212		$	3,078
	Decrease in valuations allowance - Operations		—			(2,650	)		(2,912	)
	Decrease in valuations allowance - Other		—			(1,400	)		(2,300	)
	Nondeductible expense and nontaxable income		127			(370	)		21
	State income taxes		224			98			108
	Foreign income taxes		127			122			71
	Other		(5	)		(18	)		(15	)
	Income tax expense (benefit)	$	2,830		$	(1,006	)	$	(1,949	)
Components of Deferred Income Taxes	Components of our deferred income taxes as of December 31, 2014 and 2013 are as follows:
	(In thousands)	2014			2013
	Deferred tax assets:
	Reserves - Other	$	325		$	251
	U.S. net operating loss carryforwards		86,382			88,562
	State net operating loss carryforwards		281			347
	Tax credit carryforwards		5,863			5,619
	Stock-based compensation		2,623			2,839
	Intangible assets		538			978
	Depreciable assets		1,461			1,430
	Other assets		712			649
	Total deferred tax assets		98,185			100,675
	Deferred tax liabilities:
	Prepaid expenses		(496	)		(418	)
	Total deferred tax assets		97,689			100,257
	Less valuation allowance		(46,038	)		(46,209	)
	Net deferred tax assets	$	51,651		$	54,048

Quarterly_Results_of_Operation1

Quarterly Results of Operations (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Summary of Quarterly Results of Operations	The following is a summary of the quarterly results of operations for the years ended December 31, 2014 and 2013:
			Quarter Ended
	(In thousands except per share data)		March 31		June 30		September 30		December 31
	2014
	Revenues		$	12,162	$	12,615	$	12,705	$	12,865
	Gross margin			10,137		10,583		10,643		10,660
	Net income			1,059		977		1,163		904
	Basic net income per common share*			0.02		0.02		0.02		0.02
	Diluted net income per common share*			0.02		0.02		0.02		0.02
	2013
	Revenues		$	11,764	$	11,838	$	12,225	$	12,311
	Gross margin			9,828		9,935		10,321		10,440
	Net income			567		1,871		3,175		4,840
	Basic net income per common share*			0.01		0.03		0.05		0.08
	Diluted net income per common share*			0.01		0.03		0.05		0.08
	*	Net income per share is calculated independently for each quarter. The sum of Net income per share for each quarter may not equal the total Net income per share for the year due to rounding differences.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule Of Significant Accounting Policies [Line Items]
Cash investments maturities	3 months
Goodwill	$2,161,000	$2,161,000
Goodwill to total asset	3.00%	2.00%
Impairment	0
Accumulated deferred tax assets	-46,038,000	-46,209,000
Total deferred tax asset not subject to a valuation allowance	51,651,000	54,048,000
Temporary timing differences between GAAP and tax-related expense	5,200,000
Income tax credits	5,863,000	5,619,000
Alternative Minimum Tax credits	1,100,000
Recorded warranty expense	0
Research and development expenses	9,051,000	9,563,000	7,419,000
Advertising expense	2,900,000	959,000	538,000
Federal [Member]
Schedule Of Significant Accounting Policies [Line Items]
Federal net operating loss carryforwards	43,500,000
State [Member]
Schedule Of Significant Accounting Policies [Line Items]
Income tax credits	1,900,000
Computer and Office Equipment [Member]
Schedule Of Significant Accounting Policies [Line Items]
Estimated useful lives of depreciated or amortized Property and equipment	3 years
Office Equipment [Member]
Schedule Of Significant Accounting Policies [Line Items]
Estimated useful lives of depreciated or amortized Property and equipment	3 years
Software [Member]
Schedule Of Significant Accounting Policies [Line Items]
Estimated useful lives of depreciated or amortized Property and equipment	3 years
Research and development expenses	$0
Leasehold Improvements [Member]
Schedule Of Significant Accounting Policies [Line Items]
Estimated useful lives of depreciated or amortized Property and equipment	5 years
Furniture and Fixtures [Member]
Schedule Of Significant Accounting Policies [Line Items]
Estimated useful lives of depreciated or amortized Property and equipment	5 years

Stock_Options_and_Stockbased_E2

Stock Options and Stock-based Employee Compensation - Summary of Common Stock Options (Detail)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Summary Of Stock Option Activities [Line Items]
Authorized Shares	14,250,000
Options Outstanding	4,490,509	6,748,374	7,684,776	7,147,450
Options Vested	4,135,731
Shares Available for Grant	839,404
1995 Long-term Incentive Plan [Member]
Summary Of Stock Option Activities [Line Items]
Authorized Shares	1,825,000
Options Outstanding	350,000
Options Vested	350,000
2001 Stock Option Plan [Member]
Summary Of Stock Option Activities [Line Items]
Authorized Shares	2,525,000
Options Outstanding	428,296
Options Vested	428,296
2001 Employee Stock Option Plan [Member]
Summary Of Stock Option Activities [Line Items]
Authorized Shares	300,000
Options Outstanding	12,860
Options Vested	12,860
2003 New Employee Stock Option Plan [Member]
Summary Of Stock Option Activities [Line Items]
Authorized Shares	500,000
Options Outstanding	12,000
Options Vested	12,000
2004 Stock Option Plan [Member]
Summary Of Stock Option Activities [Line Items]
Authorized Shares	5,000,000
Options Outstanding	2,706,353
Options Vested	2,665,514
2004 Director's Stock Option Plan [Member]
Summary Of Stock Option Activities [Line Items]
Authorized Shares	300,000
Options Outstanding	65,000
Options Vested	65,000
2006 Director's Stock Option Plan [Member]
Summary Of Stock Option Activities [Line Items]
Authorized Shares	1,100,000
Options Outstanding	255,500
Options Vested	255,500
2012 Incentive Plan [Member]
Summary Of Stock Option Activities [Line Items]
Authorized Shares	2,700,000
Options Outstanding	660,500
Options Vested	346,561
Shares Available for Grant	839,404

Stock_Options_and_Stockbased_E3

Stock Options and Stock-based Employee Compensation - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share Based Compensation [Line Items]
Expiry of option	10 years
Vesting period of options	3 years
Shares available for issuance	14,250,000
Total unrecognized stock-based compensation related to non-vested stock-based compensation awards	$2,500,000
The number of years over which cost is expected to be recognized	1 year 6 months
Options granted during period	0
Stock option exercised	407,829	839,263	174,968
Tax benefit from stock option exercised	99,000
Deferred tax assets, tax deferred expense compensation and benefits employee compensation	236,000	321,000
Options Outstanding	4,490,509	6,748,374	7,684,776	7,147,450
Options, options exercisable	4,135,731
Number Exercisable	4,135,731
Tax benefit from RSA's vested	69,000
2012 Plan [Member]
Share Based Compensation [Line Items]
Vesting period of options	4 years
Shares available for issuance	2,700,000
Additional shares underlying options outstanding	1,327,000
Stock Options [Member]
Share Based Compensation [Line Items]
Aggregate intrinsic value of options exercised	716,000	1,900,000
Number Exercisable		5,908,498	6,412,505
Options Outstanding to Non-employees [Member]
Share Based Compensation [Line Items]
Options outstanding to non-employees	25,000
Restricted Stock [Member]
Share Based Compensation [Line Items]
Deferred tax assets, tax deferred expense compensation and benefits employee compensation	227,000
Employee and Director Stock Options [Member]
Share Based Compensation [Line Items]
Options Outstanding	2,207,201	4,110,030
Options, options exercisable	1,852,423	3,270,154
Aggregate intrinsic value of options outstanding	2,400,000	6,600,000
Aggregate intrinsic value of options exercisable	$2,100,000	$5,200,000

Stock_Options_and_Stockbased_E4

Stock Options and Stock-based Employee Compensation - Summary of Stock-Based Employee Compensation Expense (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$1,681	$1,711	$1,166
Cost of Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	180	172	136
Research and Development Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	237	212	142
Selling, General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$1,264	$1,327	$888

Stock_Options_and_Stock_based_

Stock Options and Stock based Employee Compensation - Schedule of Fair Value Option Award (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Risk-free interest rate		1.05%	0.92%
Expected option life (years)	0 years	5 years 9 months 18 days	6 years
Expected stock price volatility		69.00%	74.00%
Expected dividend yield	0.00%	0.00%	0.00%
Fair value of options granted		$1.99	$1.72

Stock_Options_and_Stockbased_E5

Stock Options and Stock-based Employee Compensation - Summary of All Stock Option Transactions (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares, Outstanding, Beginning Balance	6,748,374	7,684,776	7,147,450
Weighted Average Exercise Price, Outstanding, Beginning Balance	$4.50	$4.28	$4.48
Shares, Granted at market price		150,000	1,099,000
Shares, Cancelled or expired	-1,850,036	-247,139	-386,706
Shares, Exercised	-407,829	-839,263	-174,968
Shares, Outstanding Ending Balance	4,490,509	6,748,374	7,684,776
Shares, Options Exercisable	4,135,731
Weighted Average Exercise Price, Granted at market price		$3.27	$2.69
Weighted Average Exercise Price, Cancelled or expired	$7.71	$5.15	$4.69
Weighted Average Exercise Price, Exercised	$1.83	$2.03	$1.76
Weighted Average Exercise Price, Outstanding, Ending Balance	$3.42	$4.50	$4.28
Weighted Average Exercise Price, Options exercisable	$3.49
Weighted Average Remaining Contractual Term, Outstanding	3 years 11 months 16 days
Weighted Average Remaining Contractual Term, Options exercisable	3 years 8 months 1 day

Stock_Options_and_Stockbased_E6

Stock Options and Stock-based Employee Compensation - Summarized Information about Stock Options Outstanding by Range of Exercise Prices (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Stock Options [Line Items]
Number Outstanding	4,490,509	6,748,374	7,684,776	7,147,450
Weighted Average Remaining Contractual Life, Options Outstanding	3 years 11 months 16 days
Weighted Average Exercise Price, Options Outstanding	$3.42
Number Exercisable	4,135,731
Weighted Average Exercise Price, Options Exercisable	$3.49
$ 1.11 - $ 1.99 [Member]
Schedule Of Stock Options [Line Items]
Range of Exercise Prices, Lower range	$1.11
Range of Exercise Prices, Upper range	$1.99
Number Outstanding	400,553
Weighted Average Remaining Contractual Life, Options Outstanding	2 years 7 months 21 days
Weighted Average Exercise Price, Options Outstanding	$1.46
Number Exercisable	400,553
Weighted Average Exercise Price, Options Exercisable	$1.46
$ 2.00 - $ 3.49 [Member]
Schedule Of Stock Options [Line Items]
Range of Exercise Prices, Lower range	$2
Range of Exercise Prices, Upper range	$3.49
Number Outstanding	1,806,648
Weighted Average Remaining Contractual Life, Options Outstanding	5 years 6 months 26 days
Weighted Average Exercise Price, Options Outstanding	$2.73
Number Exercisable	1,451,870
Weighted Average Exercise Price, Options Exercisable	$2.74
$ 3.50 - $ 4.99 [Member]
Schedule Of Stock Options [Line Items]
Range of Exercise Prices, Lower range	$3.50
Range of Exercise Prices, Upper range	$4.99
Number Outstanding	2,283,308
Weighted Average Remaining Contractual Life, Options Outstanding	2 years 11 months 1 day
Weighted Average Exercise Price, Options Outstanding	$4.32
Number Exercisable	2,283,308
Weighted Average Exercise Price, Options Exercisable	$4.32

Recovered_Sheet1

Stock Options and Stock-Based Employee Compensation Expense - Summary of All Restricted Stock Activity (Detail) (Restricted Stock [Member], USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Shares, Unvested Beginning balance	648,250	351,000	0
Restricted Shares, Granted at market price	140,000	385,000	351,000
Restricted Shares, Vested	-184,000	-87,750	0
Restricted Shares, Cancelled	0	0	0
Restricted Shares, Unvested restricted stock , Ending balance	604,250	648,250	351,000
Weighted Average Fair Value, Unvested, Beginning balance	$3.06	$2.49	$0
Weighted Average Fair Value, Granted at market price	$4.66	$3.45	$2.49
Weighted Average Fair Value, Vested	$2.99	$2.49	$0
Weighted Average Fair Value, Cancelled	$0	$0	$0
Weighted Average Fair Value, Unvested restricted stock, Ending balance	$3.45	$3.06	$2.49

Stock_Options_and_Stockbased_E7

Stock Options and Stock-based Employee Compensation - Summary of All Restricted Stock Unit Activity (Detail) (Restricted Stock Units (RSUs) [Member], USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Shares, Unvested Beginning balance	179,750	113,000	0
Restricted Shares, Granted at market price	55,000	95,000	113,000
Restricted Shares, Vested	-52,000	-28,250	0
Restricted Shares, Cancelled	0	0	0
Restricted Shares, Unvested restricted stock , Ending balance	182,750	179,750	113,000
Weighted Average Fair Value, Unvested, Beginning balance	$3	$2.49	$0
Weighted Average Fair Value, Granted at market price	$4.66	$3.45	$2.49
Weighted Average Fair Value, Vested	$2.93	$2.49	$0
Weighted Average Fair Value, Cancelled	$0	$0	$0
Weighted Average Fair Value, Unvested restricted stock, Ending balance	$3.52	$3	$2.49

Stock_Options_and_Stockbased_E8

Stock Options and Stock-based Employee Compensation - Summary of Performance Unit Activity (Detail) (Performance Units [Member], USD $)	12 Months Ended
	Dec. 31, 2014
Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Shares, Unvested Beginning balance	0
Restricted Stock Units, Granted at market price	100,000
Restricted Stock Units, Vested	0
Restricted Stock Units, Forfeited	100,000
Restricted Shares, Unvested restricted stock , Ending balance	0
Weighted Average Fair Value, Unvested, Beginning balance	$0
Weighted Average Fair Value, Granted at market price	$4.66
Weighted Average Fair Value, Vested	$0
Weighted Average Fair Value, Cancelled	$4.66
Weighted Average Fair Value, Unvested restricted stock, Ending balance	$0

Supplemental_Cash_Flow_Informa2

Supplemental Cash Flow Information - Supplemental Cash Flow Information Relating to Taxes and Non-Cash Activities (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]
Income tax payments	$426	$217	$350
Payables related to purchases of capitalized assets	-12	-97	34
Excess tax benefit on exercise and vesting of employee equity awards	$168	$427	$10

Receivables_Net_Summary_of_Net

Receivables, Net - Summary of Net Receivables (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable, Net, Current [Abstract]
Gross accounts receivables	$8,116	$8,359
Allowance for returns and doubtful accounts	-108	-46
Unpaid portion of deferred revenue	-6,556	-5,989
Note receivable	458	458
Allowance for note receivable	-458	-458
Receivables, net	$1,452	$2,324

Receivables_Net_Additional_Inf

Receivables, Net - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivables	$8,116	$8,359
Percentage of doubtful debts on accounts receivable	2.50%
Note receivable on a product line	540
Date of note receivable, reserved	31-Dec-14
Tenant Improvement Allowance [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivables	$318	$863

Recovered_Sheet2

Prepaid and Other Current Assets - Schedule of Prepaid and Other Current Assets (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Prepaid Expense and Other Assets, Current [Abstract]
Prepaid insurance, maintenance, software licenses and other	$1,954	$1,489
Deferred commissions	443	320
Deferred rent		261
Tax-related	-25	-32
Prepaid and other current assets	$2,372	$2,038

Property_and_Equipment_Summary

Property and Equipment - Summary of Property and Equipment (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]
Property and equipment gross	$31,327	$29,346
Less accumulated depreciation and amortization	-26,928	-26,738
Total Property and Equipment	4,399	2,608
Computer and Office Equipment and Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment gross	23,013	22,550
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment gross	6,398	5,276
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment gross	$1,916	$1,520

Property_and_Equipment_Additio

Property and Equipment - Additional information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Abstract]
Depreciation and amortization	$1,623	$1,466	$1,343

Goodwill_Additional_Informatio

Goodwill - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$2,161,000	$2,161,000
Goodwill impairment	$0

Accrued_Expenses_Summary_of_Ac

Accrued Expenses - Summary of Accrued Expenses (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Accounts Payable and Accrued Liabilities, Current [Abstract]
Employee compensation and benefits	$1,061	$872
Professional fees	473	469
Taxes	378	350
Other	1,018	301
Total accrued expenses	$2,930	$1,992

Earnings_Per_Share_and_Potenti2

Earnings Per Share and Potential Dilution - Computations of Basic and Diluted Earnings Per Share (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Weighted Average Number of Shares [Line Items]
Basic weighted average shares	57,948,864	61,139,035	62,211,228
Potential dilutive common shares	58,966,625	62,526,507	62,875,347
Employee and Director Stock Options [Member]
Weighted Average Number of Shares [Line Items]
Effect of dilutive securities	782,659	1,095,227	637,676
Restricted Stock [Member]
Weighted Average Number of Shares [Line Items]
Effect of dilutive securities	181,219	225,741	20,003
Restricted Stock Units (RSUs) [Member]
Weighted Average Number of Shares [Line Items]
Effect of dilutive securities	53,832	66,504	6,440
Performance Units [Member]
Weighted Average Number of Shares [Line Items]
Effect of dilutive securities	51

Earnings_Per_Share_and_Potenti3

Earnings Per Share and Potential Dilution - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Employee and Director Stock Options [Member]
Weighted Average Number of Shares [Line Items]
Effect of dilutive securities	3,240,594	4,054,261	5,645,239
Restricted Stock [Member]
Weighted Average Number of Shares [Line Items]
Effect of dilutive securities	147,292	31,281
Restricted Stock Units (RSUs) [Member]
Weighted Average Number of Shares [Line Items]
Effect of dilutive securities	50,833	7,719
Performance Units [Member]
Weighted Average Number of Shares [Line Items]
Effect of dilutive securities	33,333

Significant_Customers_Addition

Significant Customers - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	Customer	Customer	Customer
Related Party Transactions [Abstract]
Customer accounted for revenue	0	0	0
Percentage of revenue generated	10.00%	10.00%	10.00%
Percentage of accounts receivables from one customer in net total			12.00%

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
Rental expense on operating lease	$1.40	$1.30	$1.30
Operating leases, expiration year	2024

Commitments_and_Contingencies_2

Commitments and Contingencies - Summary of Fixed Contractual Obligations and Commitments (Detail) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2015	$1,433
2016	1,172
2017	1,064
2018	1,014
2019	1,030
Thereafter	5,160
Total	$10,873

Income_Taxes_Components_of_Inc

Income Taxes - Components of Income Taxes (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
U.S.	$67	$124	$116
State	240	148	164
Foreign	125	123	66
Deferred
Federal	2,396	-1,400	-2,300
State	0	0	0
Foreign	2	-1	5
Income tax expense (benefit)	$2,830	($1,006)	($1,949)

Income_Taxes_Schedule_of_Recon

Income Taxes - Schedule of Reconciliation of Tax Expense Benefit to Income Taxes (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Expected tax (benefit) expense at U.S. statutory rate	$2,357	$3,212	$3,078
Decrease in valuations allowance - Operations		-2,650	-2,912
Decrease in valuations allowance - Other		-1,400	-2,300
Nondeductible expense and nontaxable income	127	-370	21
State income taxes	224	98	108
Foreign income taxes	127	122	71
Other	-5	-18	-15
Income tax expense (benefit)	$2,830	($1,006)	($1,949)

Income_Taxes_Components_of_Def

Income Taxes - Components of Deferred Income Taxes (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Deferred tax assets:
Reserves - Other	$325	$251
U.S. net operating loss carryforwards	86,382	88,562
State net operating loss carryforwards	281	347
Tax credit carryforwards	5,863	5,619
Stock-based compensation	2,623	2,839
Intangible assets	538	978
Depreciable assets	1,461	1,430
Other assets	712	649
Total deferred tax assets	98,185	100,675
Deferred tax liabilities:
Prepaid expenses	-496	-418
Total deferred tax assets	97,689	100,257
Less valuation allowance	-46,038	-46,209
Net deferred tax assets	$51,651	$54,048

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Operating loss carryforwards	$86,382,000	$88,562,000
Change valuation allowance related to deferred tax assets		4,100,000	5,200,000
Unrecognized tax benefits to significantly increase or decrease	12 months
Statute of limitations by major tax jurisdictions	3 years
General Business Tax Credit Carry Forward [Member]
Income Taxes [Line Items]
Federal tax expense net/tax credit carryforwards	4,100,000
Tax credit carry forward began to expiration	2015
State [Member]
Income Taxes [Line Items]
Federal tax expense net/tax credit carryforwards	1,700,000
Operating loss carryforwards, expiration dates	2027
Internal Revenue Service (IRS) [Member]
Income Taxes [Line Items]
Operating loss carryforwards	$254,000,000
U.S. net operating loss carryforwards expire	2020

Employee_Benefit_Plan_Addition

Employee Benefit Plan - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]
Employees contribution of operating income	$354	$297	$221

ZixCorp_Repurchase_Program_Add

ZixCorp Repurchase Program - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 30, 2014	Nov. 06, 2013	Nov. 09, 2011
Equity [Abstract]
Shares repurchased	4,070,195	1,976,900	3,080,966
Treasury repurchase program	$16,239,000	$8,760,000	$9,000,000
Share repurchase program authorized amount				$10,000,000	$15,000,000	$15,000,000

Quarterly_Results_of_Operation2

Quarterly Results of Operations (Unaudited) - Summary of Quarterly Results of Operations (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Revenues	$12,865	$12,705	$12,615	$12,162	$12,311	$12,225	$11,838	$11,764	$50,347	$48,138	$43,356
Gross margin	10,660	10,643	10,583	10,137	10,440	10,321	9,935	9,828	42,023	40,524	35,747
Net income	$904	$1,163	$977	$1,059	$4,840	$3,175	$1,871	$567	$4,103	$10,453	$11,003
Basic net income per common share	$0.02	$0.02	$0.02	$0.02	$0.08	$0.05	$0.03	$0.01	$0.07	$0.17	$0.18
Diluted net income per common share	$0.02	$0.02	$0.02	$0.02	$0.08	$0.05	$0.03	$0.01	$0.07	$0.17	$0.17

Subsequent_Events_Additional_I

Subsequent Events - Additional Information (Detail) (USD $)	0 Months Ended
In Millions, unless otherwise specified	Jan. 06, 2015	Jul. 30, 2014	Nov. 06, 2013	Nov. 09, 2011
Subsequent Event [Line Items]
Share repurchase program authorized amount		$10	$15	$15
Subsequent Event [Member]
Subsequent Event [Line Items]
Share repurchase program authorized amount	$10
Share Repurchase Program expiration date	31-Jul-15